/* 重置样式 */
*{padding: 0;margin: 0;}
a{text-decoration: none;}
li{list-style: none;}
/* 头部 */
.header-container{
    border-bottom: 1px solid #000;
}
.header{
    width: 1200px;
    height: 60px;
    border-top: 5px solid #f00;
    margin: 0 auto;
    display: flex;
    /* justify-content: space-between; */
    align-items: center;/* 垂直居中 */
}
.header nav{
    margin-left: auto;
}
.header nav a{
    margin-right: 20px;
    color: #000;
}
.header input{
    width: 200px;
    height: 30px;
    border: 1px solid #000;
    border-radius: 5px;
    padding-left: 10px;
    margin-right: 20px;
}
.avatar{
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

/* 内容 */
.content{
    width: 1200px;
    margin: 20px auto;
    display: flex;
    justify-content: space-between;
    border-top: 5px solid #f00;
}
.content-left{
    width: 200px;
    border: 1px solid #000;
    text-align: center;
}
.content-right{
    width: 950px;
    border: 1px solid #000;
}
